Autosomal Chromosome Disorders and Variations

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Abstract
Chromosomal abnormalities or variations are related to genetics in three ways: they involve the genetic material, and in that sense are always "genetic"; most of the variants and a proportion of the structural rearrangements are directly transmitted from parent to offspring (i.e., such changes can be inherited); and some of the chromosome abnormalities arise as a result of an aberration in the meiotic process by which the diploid (2n) number of chromosomes is reduced to the haploid (n) number found in sperm and egg. Thus, the common numerical changes (e.g., trisomy 21, 18 or 13) are thought to arise by . . .

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